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olga nikolaevna [1]
3 years ago
15

If (-x^2 + y^2) is subtracted from (x^2 + y^2), the difference is

Mathematics
1 answer:
iragen [17]3 years ago
6 0

Answer:

If (-x^2 + y^2) is subtracted from (x^2 + y^2), the difference is: \mathbf{2x^2}

Option A is correct option.

Step-by-step explanation:

If (-x^2 + y^2) is subtracted from (x^2 + y^2), we need to find the difference.

When finding the difference the term after from comes first.

We can write:

(x^2 + y^2)-(-x^2 + y^2)

Now finding difference:

Multiply minus sign with terms inside the bracket

=x^2 + y^2+x^2 - y^2

Now combine the like terms

x^2 +x^2+ y^2 - y^2\\=2x^2+0\\=2x^2

So, If (-x^2 + y^2) is subtracted from (x^2 + y^2), the difference is: \mathbf{2x^2}

Option A is correct option.

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Harlamova29_29 [7]
Decimal form is (.25)
and as a fraction it is (1/4)
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5x=75 what is the value of x
dezoksy [38]
Solve the problem by doing the following
5x=75
5x/5=75/5
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A cake recipe says to bake the cake until the center is 180 degrees F, then let the cake cool to 110 degrees F. The table shows
Kobotan [32]

Answer:

Check the explanation

Step-by-step explanation:

a) The following exponential model would fit the given dataset : \small y = 129.122 \times (0.9742)^x

b) To cool down to 110 degrees, it would take approximately 7.3 minutes based on the above model.

8 0
3 years ago
Which of the following is a solution of y &gt; |x| - 6?<br><br> (-5, 1)<br> (-1, -5)<br> (5, -1)
levacccp [35]
Absolute value of x minus 6 is less than y
one way is to jsut make all the x's positive, then subtract them from 6 and see if they are less

sorry for confusing, just read below

(-5,1)
1>|-5|-6
1>5-6
1>-1
true

(-1,-5)
-5>|-1|-6
-5>1-6
-5>-5
false

(5,-1)
-1>|5|-6
-1>-1
false



answer is (-5,1)
4 0
3 years ago
Read 2 more answers
A college entrance exam company determined that a score of 24 on the mathematics portion of the exam suggests that a student is
seraphim [82]

Answer:

a) The Z -value 2.397 < 2.576 at 99% or 0.01% level of significance

Null hypothesis is accepted at  0.01% level of significance

<em>They score is above 24 on the math portion of the​ exam</em>

<em>b) </em>

<u><em>Null Hypothesis</em></u>: There is no significance difference between the college level mathematics and math courses in high school

H₀: μ = 24

<u>Alternative Hypothesis: </u>H₁: μ ≠ 24

<u>Step-by-step explanation:</u>

<u><em>Step(i)</em></u>:-

Given random sample 'n' = 250

Given data sample mean x⁻ = 24.5

Standard deviation = 3.3

<u><em>Null Hypothesis</em></u>: There is no significance difference between the college level mathematics and math courses in high school

H₀: μ = 24

<u>Alternative Hypothesis: </u>H₁: μ ≠ 24

test statistic

Z = \frac{x^{-} - mean}{\frac{S.D}{\sqrt{n} } }

Z = \frac{24.5 - 24}{\frac{3.3}{\sqrt{250} } } = \frac{0.5}{0.2087} = 2.397

a) 99% or 0.01% level of significance

Level of significance ∝ = 0.01

Z_{\frac{\alpha }{2} } = Z_{\frac{0.01}{2} } = Z_{0.005} =2.576

The Z -value 2.397 < 2.576 at 99% or 0.01% level of significance

Null hypothesis is accepted at  0.01% level of significance

<em>They score is above 24 on the math portion of the​ exam</em>

b) 95% or 0.05% level of significance

Level of significance ∝ = 0.05

Z_{\frac{\alpha }{2} } = Z_{\frac{0.05}{2} } = Z_{0.025} = 1.96

The Z -value 2.397 > 1.96 at 95% or 0.05% level of significance

Null hypothesis is Rejected at  0.05% level of significance

<em>They score is below 24 on the math portion of the​ exam</em>

6 0
3 years ago
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